US4570100A - Flat-type cathode ray tube having electrostatic and electromagnetic deflection systems - Google Patents

Flat-type cathode ray tube having electrostatic and electromagnetic deflection systems Download PDF

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Publication number
US4570100A
US4570100A US06/478,527 US47852783A US4570100A US 4570100 A US4570100 A US 4570100A US 47852783 A US47852783 A US 47852783A US 4570100 A US4570100 A US 4570100A
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United States
Prior art keywords
electrode
flat
deflection
cathode ray
ray tube
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Expired - Fee Related
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US06/478,527
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English (en)
Inventor
Hiroki Sato
Masato Hatanaka
Toshio Ohhoshi
Sakae Tanaka
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Sony Corp
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Sony Corp
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Assigned to SONY CORPORATIO reassignment SONY CORPORATIO ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: HATANAKA, MASATO, OHHOSI, TOSHIO, SATO, HIROKI, TANAKA, SAKAE
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J31/00—Cathode ray tubes; Electron beam tubes
    • H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
    • H01J31/10—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes
    • H01J31/12—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes with luminescent screen
    • H01J31/123—Flat display tubes
    • H01J31/124—Flat display tubes using electron beam scanning
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/70—Arrangements for deflecting ray or beam
    • H01J29/72—Arrangements for deflecting ray or beam along one straight line or along two perpendicular straight lines

Definitions

  • This invention relates generally to flat-type cathode ray tubes and more particularly is directed to a flat-type cathode ray tube which can reduce power consumption and also can alleviate a circular-arc distortion.
  • an electron gun is opposed to a phosphor screen and is extended backward along the direction substantially perpendicular to the phosphor screen with a result that a depth of a cathode ray tube envelope is considerably large.
  • a so-called flat-type cathode ray tube has been proposed that its electron gun is extended along the surface direction of the phosphor screen for making the tube envelope flat.
  • FIG. 1 schematically illustrates an example of such previously proposed flat-type cathode ray tube.
  • reference numeral 1 generally denotes a flat tube envelope, and in this flat tube envelope 1 are provided a target electrode 2 and a back electrode 3. These electrodes 2 and 3 are opposed to each other in the thickness direction of the flat tube envelope 1 (that is, the up-and-down-direction in the drawing).
  • On the target electrode 2 is formed a phosphor screen 4.
  • An electron gun 5 is provided on a plane which is parallel to and remote from the phosphor screen 4. Between the electron gun 5 and the phosphor screen 4 is provided a deflection coil 6 to deflect the electron beam emitted from the electron gun 5.
  • the target electrode 2 and the back electrode 3 constitute an auxiliary deflection plate.
  • the target electrode 2 is extended to the position near the electron gun 5, surrounding the deflection region by the deflection coil 6, and the potential of the target electrode 2 is high, for example, 10 KV as compared with the potential of the back electrode 3, for example, 6 KV so that as shown in FIG. 2, within the flat tube envelope 1, particularly in the upper portion thereof is formed a diverging lens.
  • the beam emitted from the electron gun 5 is diverged with a disadvantage that the circular-arc distortion is increased.
  • the target electrode 2 forming the auxiliary deflection plate is same in potential as a last grid 5a of the electron gun 5, the beam emitted from the electron gun 5 is never accelerated further. Therefore the power consumption of the cathode ray tube is urged to increase.
  • a flat-type cathode ray tube comprising a flat tube envelope in which first and second electrodes are located to face each other in the thickness direction of the envelope to thereby form a first deflection system for performing an electrostatic deflection
  • a phosphor screen is formed at the side of the first electrode and a second deflection system is formed between the first deflection system and an electron gun for performing an electromagnetic deflection
  • a third electrode surrounding a region of the second deflection system sufficiently is formed integrally with the second electrode and a voltage lower than that of the first electrode is applied to the second and third electrodes.
  • FIGS. 1 and 2 are both schematic diagrams useful for the explanation of the present invention.
  • FIG. 3 is a cross-sectional diagram showing an embodiment of the present invention
  • FIGS. 4 to 8 are all schematic diagrams useful for the explanation of the example of FIG. 3,
  • FIGS. 9a and 9b are a diagram showing a modified examples
  • FIG. 10 is a diagram useful for the explanation of the examples of FIGS. 9a and 9b.
  • FIG. 3 like parts corresponding to those of FIG. 1 are marked with the same references and the detailed descriptions thereof will not be made.
  • FIGS. 3 and 4 there is formed a funnel-shaped electrode 10 which is integral with the back electrode 3.
  • the electrode 10 having a funnel-like portion is provided to surround the deflection region by the coil 6.
  • the tip end of this funnel-shaped electrode 10 is connected to the last grid 5a of the electron gun 5.
  • the potential of the last grid 5a namely, the potential of the back electrode 3 and the funnel-shaped electrode 10 is selected as, for example, 6 KV .
  • the target electrode 2 is formed on the region of the flat tube envelope 1 corresponding to the phosphor screen 4 and the inner side wall surface thereof. In this case, by the target electrode 2 located at the position of the inner side wall surface can be absorbed a secondary electron beam.
  • the potential of the target electrode 2 is selected higher than that of the last grid 5a, for example, as 10 KV .
  • FIGS. 5 and 6 show a vertical deflection coil 6 V formed as a saddle-shape
  • FIG. 6 shows a horizontal deflection coil 6 H formed as a troidal shape
  • broken lines represent the magnetic fluxes.
  • magnetic field becomes stronger as the upper part, namely, the side of the back electrode 3 is approached.
  • reference numeral 11 denotes a neck tube and 12 a yoke.
  • the target electrode 2 is higher in potential than the last grid 5a of the electron gun 5, the electron beam emitted from the electron gun 5 is accelerated until it will land on the target electrode 2. Therefore, the power consumption can be suppressed.
  • the target electrode 2 is high in potential, as illustrated in FIG. 7, a collimator lens is formed between both the electrodes 2 and 10.
  • the beam is not diverged more than is necessary and the circular-arc distortion can therefore be alleviated.
  • it is possible to suppress a parabola current which will be superimposed upon the vertical deflection current at every horizontal period so as to remove the circular-arc distortion.
  • the power consumption can be reduced, too.
  • the target electrode 2 is elongated to the inner side wall surface of the flat tube envelope 1 so that the electric field is changed much at the side of the back electrode 3, while the electric field is changed less at the side of the target electrode 2. Accordingly, under this state, the beam travelling near the side of the back electrode 3, namely, the beam which will land on the position far away from the electron gun 5 is given a larger force in the lower direction and therefore apt to be given an over convergence as shown by the full lines in FIG. 8. But, according to this embodiment, as illustrated in FIGS. 5 and 6, at the side of the back electrode 3, the magnetic field is strong.
  • the upper electron beam in the beams is given a larger force in the upper direction by Lorentz force and lands on the farther position from the electron gun 5 as, for example, shown by a one-dot chain line in FIG. 8, with a result that the over convergence, as aforesaid, can be removed.
  • the beam which will land near the electron gun 5 as shown by the broken line in FIG. 8 has a long cross-section in the direction perpendicular to the sheet of drawing of FIG. 8, the beam itself lands slantwise, making the spot of beam just circular.
  • the target electrode 2 is applied with a high voltage so that the beam can be accelerated post the electron gun 5 and thus the power consumption being reduced. Furthermore, since between the funnel-shaped electrode 10 and the target electrode 2 can be formed the collimator lens, it is possible to suppress the circular-arc distortion.
  • the annular-shaped yoke 12 shown in FIGS. 5 and 6 is employed but a trapezoidal yoke 12 shown in FIGS. 9A and 9B may be used.
  • a magnetic field is strong and so, a magnetic field similar to that of the example in FIG. 6 can be obtained with ease.
  • the example of FIG. 9, because of the configuration of the yoke 12, can be applied to a situation in which as shown in FIG. 10, the flat tube envelope 1 consists of a funnel-shaped upper member 13 and a flat lower member 14.
  • the upper member 13 there can be employed such one which can easily be formed by the glass-injection molding.

Landscapes

  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Details Of Television Scanning (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
US06/478,527 1981-07-22 1982-07-16 Flat-type cathode ray tube having electrostatic and electromagnetic deflection systems Expired - Fee Related US4570100A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP56114833A JPS5816451A (ja) 1981-07-22 1981-07-22 扁平型陰極線管
JP56-114833 1981-07-22

Publications (1)

Publication Number Publication Date
US4570100A true US4570100A (en) 1986-02-11

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US06/478,527 Expired - Fee Related US4570100A (en) 1981-07-22 1982-07-16 Flat-type cathode ray tube having electrostatic and electromagnetic deflection systems

Country Status (4)

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US (1) US4570100A (de)
EP (1) EP0084063A4 (de)
JP (1) JPS5816451A (de)
WO (1) WO1983000406A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5939822A (en) * 1994-12-05 1999-08-17 Semix, Inc. Support structure for flat panel displays
US9483537B1 (en) * 2008-03-07 2016-11-01 Birst, Inc. Automatic data warehouse generation using automatically generated schema

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4490652A (en) * 1982-12-30 1984-12-25 International Business Machines Corporation Flat cathode ray tube with keystone compensation
JP2667227B2 (ja) * 1988-11-02 1997-10-27 松下電子工業株式会社 偏平型受像管装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS461625B1 (de) * 1967-09-19 1971-01-16
US4451756A (en) * 1980-11-25 1984-05-29 Sony Corporation Flat cathode ray tube

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3731135A (en) * 1970-06-15 1973-05-01 Philco Ford Corp Graded field cathode ray tube
JPS5713653A (en) * 1980-06-26 1982-01-23 Sony Corp Flat type cathode-ray tube
JPS5799362U (de) * 1980-12-11 1982-06-18

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS461625B1 (de) * 1967-09-19 1971-01-16
US4451756A (en) * 1980-11-25 1984-05-29 Sony Corporation Flat cathode ray tube

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5939822A (en) * 1994-12-05 1999-08-17 Semix, Inc. Support structure for flat panel displays
US9483537B1 (en) * 2008-03-07 2016-11-01 Birst, Inc. Automatic data warehouse generation using automatically generated schema
US9652516B1 (en) 2008-03-07 2017-05-16 Birst, Inc. Constructing reports using metric-attribute combinations
US10885051B1 (en) 2008-03-07 2021-01-05 Infor (Us), Inc. Automatic data warehouse generation using automatically generated schema

Also Published As

Publication number Publication date
EP0084063A4 (de) 1983-12-19
WO1983000406A1 (en) 1983-02-03
EP0084063A1 (de) 1983-07-27
JPS5816451A (ja) 1983-01-31

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